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A numerical value calculated from a series of bits of digital data, often by summing their values, used to test whether the data has changed during storage or transmission.

check′sum′ v.


a digit representing the number of bits of information transmitted, attached to the end of a message in order to verify the integrity of data
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Noun1.checksum - a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage
confirmation, substantiation, verification, check - additional proof that something that was believed (some fact or hypothesis or theory) is correct; "fossils provided further confirmation of the evolutionary theory"
References in periodicals archive ?
Vision-based readers tend to be used in circumstances where it is simply not acceptable to receive a 'cannot read - check sum not correct' from a laser scanner.
The first is calculating a check sum during the backup process, then reading the tape, recalculating the check sum and doing a comparison--they should be equal.
If archived data is restored to the application and any changes are made, Active Archiving will compare the new check sum with the old upon re-archiving, conclude that changes have occurred, and save the newly archived data as a new file.